| 摘要: |
| 在分析变流器直流电容充放电状态和功率器件开关状态之间关系的基础上，提出了一种改进的适用于整流、无功补偿、谐波电流抑制等场合的级联H桥型变流器直流电压均衡控制方法。根据变流器交流侧能量传递方向合理地选择开关函数，调整变流器各个直流电容充放电状态，实现直流电压的均衡控制。调节均衡控制周期，可以改变直流电压均衡速率，调整均衡算法对开关频率的影响。基于MATLAB/Simulink的仿真结果表明了所提直流电压均衡控制方法的有效性。 |
| 关键词: 级联H桥型变流器 直流电压均衡控制 整流 无功补偿 谐波电流抑制 |
| DOI：10.16081/j.issn.1006-6047.2017.10.015 |
| 分类号:TM46 |
| 基金项目:中央高校基本科研业务费专项资金资助项目(2015YJS157) |
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| DC voltage balancing control for cascaded H-bridge converter |
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WU Liran, WU Mingli
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School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
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| Abstract: |
| Based on analyzing the relationship between the charging/discharging states of DC capacitors and the switching states of the power devices, an improved DC voltage balancing control method is proposed for cascaded H-bridge converter, which can be applied in various situations such as rectifier, reactive power compensation, harmonic current elimination, etc. According to the power flow direction at AC side of converter, the DC voltage balance is achieved by selecting the switching functions and adjusting the charging/discharging states of DC capacitors. By changing the balancing control cycle, the DC voltage balancing rate and the influence of balance algorithm on switching frequency can be both adjusted. Simulative results based on MATLAB/Simulink show the effectiveness of the proposed DC voltage balancing control method. |
| Key words: cascaded H-bridge converter DC voltage balancing control rectify reactive power compensation harmonic current elimination |
